Cygwin/X XDMCP Issue

[Jon TURNEY]

On 20/02/2015 18:36, Maarten Hoes wrote:
> I am (again) experiencing some issues when running Cygwin/X in
> combination with XDMCP. Opening a cygwin prompt and running 'startxwin'
> works as expected. But when I try to connect to my remote Linux system
> with the command 'xwin -query 192.168.0.21' (or with the 'XLaunch'
> program and choose XDMCP) the screen stays black. Things used to work,
> but apparently something broke my setup.
>
> Im running the latest Cygwin/X, and applied all current updates on my
> Fedora 21 Linux system. Im running KDM.
>
> Any and all ideas are more than welcome, as I have no idea whats going
> on here.

> Package: version 1.16.3-1 built 2014-12-30
> xwin -query 192.168.0.21 -logverbose 3

>   1   0.000000 192.168.0.20 -> 192.168.0.21 XDMCP 49 Query
>   2   0.013254 192.168.0.21 -> 192.168.0.20 XDMCP 100 Willing
>   3   0.227426 192.168.0.20 -> 192.168.0.21 XDMCP 360 Request
>   4   0.227831 192.168.0.21 -> 192.168.0.20 XDMCP 94 Accept
>   5   0.227968 192.168.0.20 -> 192.168.0.21 XDMCP 71 Manage

Assuming your wireshark filter includes X11, you should be seeing a X11 
connection request from 192.168.0.21 to the X server here.

Since the same X server version was working for you before (to a 
different IP address), I can only suggest you examine what else has changed.

You might want to check your firewall/network configuration.

>   6   2.225721 192.168.0.20 -> 192.168.0.21 XDMCP 71 Manage
>   7   6.229538 192.168.0.20 -> 192.168.0.21 XDMCP 71 Manage
>   8  14.230544 192.168.0.20 -> 192.168.0.21 XDMCP 71 Manage
>   9  30.228625 192.168.0.20 -> 192.168.0.21 XDMCP 71 Manage

-- 
Jon TURNEY
Volunteer Cygwin/X X Server maintainer

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